the mandibular process, which contains Meckel's cartilage (Figs. 15.5 and 15.8A). During further development, Meckel's cartilage disappears except for two small portions at its dorsal end that persist and form the incus and malleus (Figs. 15.8B and 15.9). Mesenchyme of the maxillary process gives rise to the premaxilla, maxilla, zygomatic bone, and part of the temporal bone through membranous ossification (Fig. 15.8B). The mandible is also formed by membranous ossification of mesenchymal tissue surrounding Meckel's cartilage. In addition, the first arch contributes to formation of the bones of the middle ear (see Chapter 16).
Frontonasal prominence Nasal placode
Pharyngeal arches, 2nd and 3rd
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